Ok. that's bad. My question right now is the following: If I use my unique ID as _id I can't use it anymore since I have to use the same field name (enrich index and to be enriched index) to reference it, right?.
In my to be enriched index the _id field is something completely different since it is used for another use case.
So how can I reference from my to be enriched index to the enrich index when the fields are named differently?
thx again!